Audio disappears after rendering

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The segment plays individually, and it played before when I imported the entire set of 19 video files.  But when I dropped it into the existing timeline, the video portion turns red (audio line stays normal, and the video does play).  Other clips dragged onto the timeline (so far) haven't had the same problem.  Takes maybe 45 mins to render  this bad boy, and the red line disappears, but audio drops off after a few seconds.

Project file:  https://www.dropbox.com/s/b3jtlco2vpvu9us/061921%20Patterson%20Memorial%20--%20Full%20RAW.v5.3%20all%20clips.prproj?dl=0

Windows-10 Pro v10.0.19043 build, 19043 Processor Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80GHz, 2801 Mhz, 4 Core(s), 8 Logical Processor(s) (updates to date), RAM 32gb Premiere Pro v15.2.0 build 35. Sysinfo, drives, disks info included below.  No crash logs in windows.  But there are 2 "events" errors "Unspecified drawing errors" from today randomly 

I've now deleted the rendered section, re-adding does the same thing.  Should I somehow import it into the timeline instead of dropping it in?  Is there something else I can try?  

SYS INFO:

OS Name Microsoft Windows 10 Pro
Version 10.0.19043 Build 19043
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name MTNSHOOTR
System Manufacturer Dell Inc.
System Model Precision 5510
System Type x64-based PC
System SKU 06E5
Processor Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80GHz, 2801 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date Dell Inc. 1.16.1, 2/23/2021
SMBIOS Version 2.8
Embedded Controller Version 255.255
BIOS Mode UEFI
BaseBoard Manufacturer Dell Inc.
BaseBoard Product 0WWKNF
BaseBoard Version A03
Platform Role Mobile
Secure Boot State Off
PCR7 Configuration Elevation Required to View
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume3
Locale United States
Hardware Abstraction Layer Version = "10.0.19041.1081"
User Name MTNSHOOTR\Steve
Time Zone Eastern Daylight Time
Installed Physical Memory (RAM) 32.0 GB
Total Physical Memory 31.8 GB
Available Physical Memory 11.1 GB
Total Virtual Memory 46.6 GB
Available Virtual Memory 6.80 GB
Page File Space 14.7 GB
Page File C:\pagefile.sys
Kernel DMA Protection Off
Virtualization-based security Not enabled
Device Encryption Support Elevation Required to View
Hyper-V - VM Monitor Mode Extensions Yes
Hyper-V - Second Level Address Translation Extensions Yes
Hyper-V - Virtualization Enabled in Firmware Yes
Hyper-V - Data Execution Protection Yes

DRIVES:

Drive C:
Description Local Fixed Disk
Compressed No
File System NTFS
Size 463.55 GB (497,730,367,488 bytes)
Free Space 72.08 GB (77,399,597,056 bytes)
Volume Name OS
Volume Serial Number E8D5E623

Drive 😧
Description Local Fixed Disk
Compressed No
File System NTFS
Size 931.39 GB (1,000,068,870,144 bytes)
Free Space 199.27 GB (213,964,615,680 bytes)
Volume Name DATA
Volume Serial Number CEE3FDBC

DISKS:

Description Disk drive
Manufacturer (Standard disk drives)
Model PM951 NVMe SAMSUNG 512GB
Bytes/Sector 512
Media Loaded Yes
Media Type Fixed hard disk
Partitions 5
SCSI Bus 0
SCSI Logical Unit 0
SCSI Port 0
SCSI Target ID 0
Sectors/Track 63
Size 476.94 GB (512,105,932,800 bytes)
Total Cylinders 62,260
Total Sectors 1,000,206,900
Total Tracks 15,876,300
Tracks/Cylinder 255
Partition Disk #0, Partition #0
Partition Size 500.00 MB (524,288,000 bytes)
Partition Starting Offset 1,048,576 bytes
Partition Disk #0, Partition #1
Partition Size 100.00 MB (104,857,600 bytes)
Partition Starting Offset 525,336,576 bytes
Partition Disk #0, Partition #2
Partition Size 11.73 GB (12,597,592,064 bytes)
Partition Starting Offset 764,411,904 bytes
Partition Disk #0, Partition #3
Partition Size 463.55 GB (497,730,371,072 bytes)
Partition Starting Offset 13,362,003,968 bytes
Partition Disk #0, Partition #4
Partition Size 970.00 MB (1,017,118,720 bytes)
Partition Starting Offset 511,092,719,616 bytes

Description Disk drive
Manufacturer (Standard disk drives)
Model WDC WD10SPCX-75KHST0
Bytes/Sector 512
Media Loaded Yes
Media Type Fixed hard disk
Partitions 1
SCSI Bus 0
SCSI Logical Unit 0
SCSI Port 1
SCSI Target ID 1
Sectors/Track 63
Size 931.51 GB (1,000,202,273,280 bytes)
Total Cylinders 121,601
Total Sectors 1,953,520,065
Total Tracks 31,008,255
Tracks/Cylinder 255
Partition Disk #1, Partition #0
Partition Size 931.39 GB (1,000,068,874,240 bytes)
Partition Starting Offset 135,266,304 bytes